This is a do it your selfer:
Fly in to Balta: Stay on Santa Cruz somewhere (arriving in the morning) How long to get park pass and ferry to either North Seymour Island or Santa Cruz and how much. Do we want to do North Seymour Island right away? Really don't know what to do?
Day 1 & 2 Explore Santa Cruz
Day 3: Excursion to Kicker Rock or Los Tuneles from Santa Cruz Island? From Puerto Ayora?
Day 4: Another Excursion? or stay on Sana Cruz
Day 5: Leave Early from Balta. How early to the ferries operate?